Certain 1,2,3,6-tetrahydro-pyridyl-N-lower-alkanoyl-pyridines as intermediates

ABSTRACT

New pyridine derivatives of the formula I ##STR1## wherein R 1  and R 2  are each phenyl or 2- or 3-thienyl radicals which are unsubstituted or monosubstituted or disubstituted by alkyl, alkoxy, F, Cl, Br, OH and/or CF 3  and n is 1, 2 or 3, and the alkyl and alkoxy groups each have 1-4 C atoms, and salts thereof, have suppressant actions on the central nervous system, in particular neuroleptic actions.

The invention relates to new pyridine derivatives.

SUMMARY OF THE INVENTION

It is an object of this invention to provide new compounds which can beused for the preparation of medicaments.

Upon further study of the specification and appended claims, furtherobjects and advantages of this invention will become apparent to thoseskilled in the art.

These objects have been achieved by providing new pyridine derivativesof formula I ##STR2## wherein R¹ and R² are independently each phenyl or2- or 3-thienyl radicals which are unsubstituted or monosubstituted ordisubstituted by alkyl, alkoxy, F, Cl, Br, OH and/or CF₃ and n is 1, 2or 3, and the alkyl and alkoxy groups each have 1-4 C atoms, and saltsthereof.

DETAILED DISCUSSION

It has been found that the compounds of this invention have usefulpharmacological properties, coupled with good tolerance. Thus, forexample, they exhibit actions which influence the central nervoussystem, preferably suppressing (for example sedating, tranquilizing,neuroleptic and/or antidepressant) actions. Specifically, the compoundshave a suppressant action on the behavior of mice (for the method,compare Irwin, Psychopharmacologia 13 (1968), 222-257), inhibitapomorphine-induced climbing behavior in mice (for the method, compareCostall et al., European J. Pharmacol. 50 (1968), 39-50) or inducecontralateral turning behavior in hemi-Parkinson rats (detectable by themethod of Ungerstedt et al., Brain Res. 24 (1970), 485-493), withoutnoticeable cataleptic side effects occurring (for the method, compareDolini-Stola, Pharmakopsychiat. 6 (1973), 189-197). The substancesfurthermore inhibit bonding of tritiated dopamine agonists andantagonists to striated receptors (detectable by the method of Schwarczet al., J. Neurochemistry 34 (1980), 772-778, and Creese et al.,European J. Pharmacol., 46 (1977), 377-381). The compounds additionallyinhibit the tongue/jaw reflex in anaesthetized rats (detectable inaccordance with the methods of Barnett et al., European J. Pharmacol. 21(1973), 178-182 and of Ilhan et al., European J. Pharmacol. 33 (1975),61-64). Analgesic and hypotensive actions also arise; thus, the arterialblood pressure measured directly on conscious, spontaneouslyhypertensive rats carrying catheters (strain SHR/NIH-MO//CHB-EMD; forthe method compare Weeks and Jones, Proc. Soc. Exptl. Biol. Med. 104(1960), 646-648), is reduced following intragastral administration ofthe compounds.

Compounds of the formula I and their physiologically acceptable acidaddition salts can therefore be used as medicament active compounds andalso as intermediate products for the preparation of other medicamentactive compounds.

The invention relates to the pyridine derivatives of the formula I andtheir salts.

In the radicals R¹ and R², alkyl is preferably methyl, and furthermorealso ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec.-butyl ortert.-butyl. Alkoxy is preferably methoxy, and furthermore also ethoxy,n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec.-butoxy of tert.-butoxy.

The radicals R¹ and R² are preferably unsubstituted phenyl. If R¹ and/orR² denote a substituted phenyl group, this is preferablymonosubstituted.

However, it can also be disubstituted, it being possible for thesubstituents to be identical or different. Preferred substituents on thephenyl groups are methyl, ethyl, methoxy, ethoxy, F, Cl, Br and/or OH.Specifically, R¹ and R² are preferably phenyl, and furthermore o-, m- orp-tolyl, o-, m- or p-ethylphenyl, o-, m- or p-methoxyphenyl, o-, m- orp-ethoxyphenyl, o-, m- or p-fluorophenyl, o-, m- or p-chlorophenyl, o-,m- or p-bromophenyl, o-, m- or p-hydroxyphenyl, o-, m- orp-trifluoromethylphenyl, 2,3-, 2,4-, 2,5, 2,6-, 3,4- or3,5-dimethylphenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dimethoxyphenyl,2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-difluorophenyl, 2,3-, 2,4-, 2,5-,2,6-, 3,4- or 3,5-dichlorophenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or3,5-dihydroxyphenyl, 2-methyl-4-chlorophenyl, 2- or 3- thienyl or5-methyl-2-thienyl.

The parameter n is preferably 1, and the radical --C_(n) H_(2n) -- ispreferably --CH₂ --, or furthermore preferably --CH(CH₃)--, --(CH₂)₂ or--(CH₂)₃.

The invention accordingly particularly relates to those compounds of theformula I in which at least one of the radicals mentioned has one of theabovementioned meanings, in particular the abovementioned preferredmeanings. Some preferred groups of compounds can be expressed by thefollowing part formulae Ia to Ij, which correspond to the formula I andin which the radicals and parameters not described in more detail havethe meaning given in the case of formula I, but wherein

in Ia

R¹ is phenyl, tolyl, methoxyphenyl, fluorophenyl, chlorophenyl,hydroxyphenyl, trifluoromethylphenyl, dimethoxyphenyl or thienyl;

in Ib

R¹ is phenyl, o-, m- or p-tolyl, m- or p-methoxyphenyl, p-fluorophenyl,p-chlorophenyl, m- or p-hydroxyphenyl, m-trifluoromethylphenyl,3,4-dimethoxyphenyl or 2-thienyl;

in Ic

R¹ is phenyl;

in Id

R² is phenyl, tolyl, methoxyphenyl, fluorophenyl, chlorophenyl,trifluoromethylphenyl, chloro-trifluoromethylphenyl or thienyl;

in Ie

R² is phenyl, o-, m- or p-tolyl, p-methoxyphenyl, p-fluorophenyl,p-chlorophenyl, m-trifluoromethylphenyl or 2- or 3-thienyl;

in If

R² is phenyl;

in Ig

C_(n) H_(2n) is --CH₂ --, --CH(CH₃)--, --(CH₂)₂ -- or (CH₂)₃ --;

in Ih

C_(n) H_(2n) is --CH₂ --;

in Ii

R¹ is phenyl, o-, m- or p-tolyl, m- or p-methoxyphenyl, p-fluorophenyl,p-chlorophenyl, m- or p-hydroxyphenyl, m-trifluoromethylphenyl,3,4-dimethoxyphenyl or 2-thienyl,

R² is phenyl, o-, m- or p-tolyl, p-methoxyphenyl, p-fluorophenyl,p-chlorophenyl, m-trifluoromethylphenyl or 2- or 3-thienyl and

C_(n) H_(2n) is --CH₂ --, --CH(CH₃)--, --(CH₂)₂ -- or --(CH₂)₃ --; and

in Ij

R¹ is phenyl, m- or p-methoxyphenyl, p-fluorophenyl, m-hydroxyphenyl or3,4-dimethoxyphenyl,

R² is phenyl and

C_(n) H_(2n) is --CH₂ --.

Some compounds of the formula I can have one or more asymmetric carbonatoms. They can therefore exist as racemates, as mixtures of severalracemates, if several asymmetric carbon atoms are present, and invarious optically active forms.

The invention furthermore relates to a process for the preparation ofthe compounds of the formula I and of their salts characterized in thata compound of the formula II

    Py--A--X.sup.1                                             II

wherein Py is the 5-R¹ -3-pyridyl radical, A is the group --C_(n) H_(2n)--, X¹ is NH₂ or X, and X is Cl, Br, I, OH or a reactively functionallymodified OH group, is reacted with a compound of the formula III

    X.sup.2 --CH.sub.2 CH.sub.2 --CR.sup.2 ═CH--CH.sub.2 --X.sup.3 III

wherein X² and X³ are identical or different and, if X¹ is NH₂, are eachX, or otherwise together are NH, and R² has the meaning given, or inthat a compound which otherwise corresponds to the formula I butcontains one or more reducible groups and/or one or more additional C--Cand/or C--N bonds instead of one or more hydrogen atoms, is treated witha reducing agent, or in that a compound of the formula IV ##STR3##wherein one radical E is X, CN or NH₂ and the other radical E is H andPy, A, R and X have the meanings given, is treated with an agent whichsplits off HE, and/or in that, if appropriate, an O-alkyl group in acompound of the formula I is split to form an OH group, and/or in that abase of the formula I is converted into one of its salts by treatmentwith an acid.

The compounds of the formula I are otherwise prepared by methods whichare known per se, such as are described in the literature (for examplein the standard works, such as Houben-Weyl, Methoden der OrganischenChemie (Methods of Organic Chemistry), Georg-Thieme-Verlag, Stuttgart;Organic Reactions, John Wiley & Sons, Inc., New York), and in particularunder reaction conditions such as are known and suitable for thereactions mentioned. Variants which are known per se and are notmentioned here in more detail can also be utilized.

If desired, the starting substances for the process claimed can also beformed in situ, in a manner such that they are not isolated from thereaction mixture but are immediately reacted further to give thecompounds of the formula I.

In the compounds of the formula II, X¹ is preferably X; accordingly, inthe compounds of the formula III, X² and X³ are preferably together NH.The radical X is preferably Cl or Br; however, it can also be I, OH or areactively functionally modified OH group, in particularalkylsulfonyloxy with 1-6 (for example methanesulfonyloxy) orarylsulfonyloxy with 6-10 C atoms (for example benzenesulfonyloxy,p-toluenesulfonyloxy or 1- or 2-naphthalene-sulfonyloxy).

The compounds of the formula I are accordingly obtainable, inparticular, by reaction of compounds of the formula Py-A-Cl or Py-A-Brwith tetrahydropyridine derivatives of the formula III wherein X² and X³together are an NH group (called IIIa below).

The compounds of the formulae II and, in particular, III are known insome cases; the compounds of the formulae II and III which are not knowncan easily be prepared analogously to the known compounds. Primaryalcohols of the formula Py-A-OH are obtainable, for example, byreduction of the corresponding carboxylic acids or their esters.Treatment with thionyl chloride, hydrogen bromide, phosphorus tribromideor similar halogen compounds gives the corresponding halides of theformula Py-A-Hal. The corresponding sulfonyloxy compounds are obtainablefrom the alcohols Py-A-OH by reaction with the corresponding sulfonicacid chlorides. The iodine compounds of the formula Py-A-I areobtainable, for example, by the action of potassium iodide on theassociated p-toluenesulfonic acid esters. The amines of the formulaPy-A-NH₂ can be prepared, for example, from the halides with potassiumphthalimide or by reduction of the corresponding nitriles.

The tetrahydropyridine derivatives IIIa are known in most cases (compareGerman Offenlegungsschrift No. 2,060,816) and are obtainable, forexample, by reaction of 4-piperidone with organometallic compounds ofthe formula M-R² (wherein M is an Li atom or MgHal), subsequenthydrolysis to give the corresponding 4-R² -4-hydroxypiperidines andsubsequent dehydration to give 4-R² -3,4-dehydro-piperidines. Compoundsof the formula III (X² and X³ are each X) can be prepared, for example,by reduction of diesters of the formula AlkylOOC--CH₂ --CR²═CH--COOAlkyl to diols of the formula HO--CH₂ CH₂ --CR² ═CH--CH₂ OH(III, X² =X³ =OH) and, if appropriate, subsequent reaction with SOCl₂ orPBr₃.

The reaction of the compounds II and III proceeds by methods such as areknown from the literature for alkylation of amines. The components canbe melted with one another, if appropriate in a closed tube or in anautoclave, in the absence of a solvent. However, it is also possible toreact the compounds in the presence of an inert solvent. Examples ofsuitable solvents are hydrocarbons, such as benzene, toluene or xylene;ketones, such as acetone or butanone; alcohols, such as methanol,ethanol, isopropanol or n-butanol; ethers, such as tetrahydrofuran (THF)or dioxane; amides, such as dimethylformamide (DMF) orN-methyl-pyrrolidone; nitriles, such as acetonitrile, and if appropriatealso mixtures of these solvents with one another or mixtures with water.The addition of an acid-binding agent, for example an alkali metalhydroxide, carbonate or bicarbonate or an alkaline earth metalhydroxide, carbonate or bicarbonate, or another alkali metal or alkalineearth metal salt of a weak acid, preferably a potassium, sodium orcalcium salt, or the addition of an organic base, such as triethylamine,dimethylaniline, pyridine or quinoline, or of an excess of the aminecomponent Py-A-NH₂ or of the piperidine derivative of the formula IIIa,may be advantageous. The reaction time is between a few minutes and 14days and the reaction temperature is between about 0° and 150°, usuallybetween 20° and 130°, depending on the conditions applied.

It is furthermore possible to obtain a compound of the formula I bytreating a precursor which contains one or more reducible group(s)and/or one or more additional C--C and/or C--N bond(s), instead ofhydrogen atoms, with a reducing agent, preferably at temperaturesbetween -80° and +250°, in the presence of at least one inert solvent.

Reducible groups (replaceable by hydrogen) are, in particular, oxygen ina carbonyl group, hydroxyl, arylsulfonyloxy (for examplep-toluenesulfonyloxy), N-benzenesulfonyl, N-benzyl or O-benzyl.

It is in principle possible to convert compounds which contain only oneof these groups or additional bonds or those which contain two or moreof these groups or additional bonds side by side into a compound of theformula I by reduction. This is preferably carried out using nascenthydrogen or complex metal hydrides, and furthermore by the Wolff-Kishnerreduction.

Preferred starting substances for the reduction correspond to theformula V ##STR4## wherein L is a chain corresponding to the radical Abut wherein one or more --CH₂ -- group(s) are replaced by --CO-- and/orone or more hydrogen atoms are replaced by OH groups.

In the compounds of the formula V, L is preferably --(CH₂)_(n-1) --CO--[specifically --CO--, --CH₂ --CO-- or --CH₂ CH₂ --CO--], andfurthermore, for example, --CH(CH₃)--CO--, --COCH₂ --, --COCO--, --COCH₂CO--, --CO--CH₂ CH₂ --, --CH₂ CO--CH₂ --, --CHOH--, --CH₂ --CHOH--,--(CH₂)₂ --CHOH--, --CHOH--CH₂ -- or --CHOH--CO--.

Compounds of the formula V can be prepared, for example, by reactingIIIa with a compound of the formula VI

    Py--L--X.sup.1                                             VI

wherein Py, L and X¹ have the abovementioned meanings, under theconditions which are described above for the reaction of II and III.

If nascent hydrogen is used as the reducing agent, this can be produced,for example, by treatment of metals with weak acids or with bases. Thus,for example, a mixture of zinc with an alkali metal hydroxide solutionor of iron with acetic acid can be used. The use of sodium or anotheralkali metal in an alcohol, such as ethanol, isopropanol, butanol oramyl or isoamyl alcohol or phenol is also suitable. An aluminum/nickelalloy in alkaline-aqueous solution, if appropriate with the addition ofethanol, can furthermore be used. Sodium amalgam or aluminum amalgam inaqueous-alcoholic or aqueous solution are also suitable for producingnascent hydrogen. The reaction can also be carried out in aheterogeneous phase system, an aqueous phase and a benzene or toluenephase advantageously being used.

Complex meal hydrides, such as LiAlH₄, NaBH₄, diisobutylaluminum hydrideor NaAl(OCH₂ CH₂ OCH₃)₂ H₂, and diborane can furthermore be particularlyadvantageously used as the reducing agent, if desired with the additionof catalysts, such as BF₃, AlCl₃ or LiBr. Solvents which areparticularly suitable for this purpose are ethers, such as diethylether, di-n-butyl ether, THF, dioxane, diglyme or 1,2-dimethoxyethane,and hydrocarbons, such as benzene. Solvents which are suitable forreduction with NaBH₄ are, above all, alcohols, such as methanol orethanol, and furthermore water and aqueous alcohols. The reduction bythese methods is preferably carried out at temperatures between -80° and+150°, in particular between about 0° and about 100°.

--CO-- groups in acid amides (for example those of the formula V whereinL is --(CH₂)_(n-1) --CO--) can be particularly advantageously reduced toCH₂ groups with LiAlH₄ in THF at temperatures between about 0° and 66°.

It is furthermore possible to reduce one or more carbonyl groups to CH₂groups by the Wolff-Kishner method, for example by treatment withanhydrous hydrazine in absolute ethanol under pressure at temperaturesbetween about 150° and 250°. A sodium alcoholate is advantageously usedas the catalyst. The reduction can also be varied according to themethod of Huang-Minlon, by carrying out the reaction with hydrazinehydrate in a high-boiling, water-miscible solvent, such as diethyleneglycol or triethylene glycol, in the presence of an alkali, such assodium hydroxide. The reaction mixture is as a rule boiled for about 3-4hours. The water is then distilled off and the hydrazone formed isdecomposed at temperatures up to about 200°. The Wolff-Kishner reductioncan also be carried out at room temperature in dimethyl sulphoxide withhydrazine.

Compounds of the formula I are furthermore obtained by splitting off HEfrom compounds of the formula IV to form a double bond. In accordancewith the definition of E, this can be, for example, splitting off ofhydrogen halide, water (dehydration), a carboxylic acid or another acid,ammonia or HCN. The starting substances of the formula IV areobtainable, for example, by reacting II (X¹ =X) with a compound of theformula VII ##STR5## wherein E and R² have the meanings given.

If one of the radicals E is Hal, this substituent can easily beeliminated under basic reaction conditions. Bases which can be used are:alkali metal hydroxides, alkali metal carbonates, alcoholates, such as,for example, potassium tert.-butylate, and amines, such as, for example,dimethylaniline, pyridine, collidine or quinoline; examples of solventswhich are used are benzene, toluene, cyclohexane, THF and tert.-butanol.The amines used as bases can also be employed in excess as the solvent.If one of the radicals E is an OH group, acids, such as acetic acid,hydrochloric acid or mixtures of the two, are preferably used as thedehydrating agent. It may be advantageous to add a solvent (for examplewater or ethanol). Elimination of acyl, alkylsulfonyl andalkoxysulfonyloxy or amino radicals can be carried out under similarconditions. Elimination of sulfonic acid radicals, for example those ofthe mesylates or tosylates, is carried out under gentle conditions byboiling with alkali metal carbonates, for example Li₂ CO₃, or withpotassium acetate in DMF or dimethyl sulphoxide. Ammonia can already besplit off by heating the salts of the corresponding amino compounds (inparticular the 4-amino derivatives). HCN can be split off from compoundsof the formula IV (one group E=CN) in a similar manner by heating. Theelimination of HE from IV is generally carried out at temperaturesbetween 0° and about 250°, preferably between 50° and 200°.

If appropriate, a compound of the formula I can furthermore be convertedinto another compound of the formula I by methods which are known perse.

Thus, ethers (O-alkyl derivatives) can be split, the correspondinghydroxy derivatives being formed. For example, the ethers can be splitby treatment with a dimethyl sulphide-boron tribromide complex, forexample in toluene, 1,2-dichloroethane, THF or dimethyl sulphoxide, orby melting with pyridine hydrohalides or aniline hydrohalides,preferably pyridine hydrochloride, at about 150°-250°.

The resulting base of the formula I can be converted into the associatedacid addition salt with an acid. Acids which are preferably suitable forthis reaction are those which give physiologically acceptable salts.Thus, it is possible to use inorganic acids, for example sulfuric acid,hydrogen halide acids, such as hydrochloric acid or hydrobromic acid,phosphoric acids, such as orthophosphoric acid, nitric acid and sulfamicacid, and furthermore organic acids, specifically aliphatic, alicyclic,araliphatic, aromatic or heterocyclic monobasic or polybasic carboxylic,sulfonic or sulfuric acids, such as formic acid, acetic acid, propionicacid, pivalic acid, diethylacetic acid, malonic acid, succinic acid,pimelic acid, fumaric acid, maleic acid, lactic acid, tartaric acid,malic acid, benzoic acid, salicylic acid, 2-phenylpropionic acid, citricacid, gluconic acid, ascorbic acid, nicotinic acid, isonicotinic acid,methane- or ethane-sulfonic acid, ethanedisulfonic acid,2-hydroxyethanesulfonic acid, benzenesulfonic acid, p-toluenesulfonicacid, naphthalene-mono- and -disulfonic acids and lauryl-sulfuric acid.Acid addition salts which are not physiologically acceptable (forexample picrates) may be suitable for isolation and purification ofbases of the formula I.

If desired, the free bases of the formula I can be liberated from theirsalts by treatment with strong bases, such as sodium hydroxide orpotassium hydroxide or sodium carbonate or potassium carbonate.

The invention furthermore relates to the use of the compounds of theformula I and their physiologically acceptable salts for the preparationof pharmaceutical formulations, in particular by a non-chemical route.For this, they can be brought into a suitable dosage form together withat least one excipient or auxiliary and, if appropriate, in combinationwith one or more other active compound(s).

The invention furthermore relates to agents, in particularpharmaceutical formulations, containing at least one compound of theformula I and/or one of its physiologically acceptable salts. Theseformulations can be employed as medicaments in human medicine orveterinary medicine. Possible excipients are organic or inorganicsubstances which are suitable for enteral (for example oral) orparenteral administration or topical application and with which the newcompounds do not react, for example water, vegetable oils, benzylalcohols, polyethylene glycols, gelatine, carbohydrates, such as lactoseor starch, magnesium stearate, talc or vaseline. Formulations which areused for enteral administration are, in particular, tablets, coatedtablets, capsules, syrups, elixirs, drops or suppositories, those whichare used for parenteral administration are solutions, preferably oily oraqueous solutions, and furthermore suspensions, emulsions or implants,and those which are used for topical application are ointments, creamsor powders. The new compounds can also be lyophilized and thelyophilizates obtained can be used, for example, for the preparation ofinjection products.

The formulations mentioned can be sterilized and/or contain auxiliaries,such as lubricants, preservatives, stabilizers and/or wetting agents,emulsifiers, salts for influencing the osmotic pressure, buffersubstances, colorants, flavor substances and/or aroma substances. Ifdesired, they can also contain one or more other active compounds, forexample one or more vitamins.

The invention furthermore relates to the use of the compounds of theformula I and their physiologically acceptable salts in the therapeutictreatment of the human or animal body and in combating diseases, inparticular schizophrenia, psychoreactive disorders and psychopathies,depressions, severe chronic pain and diseases accompanied by increasedblood pressure.

The compounds can furthermore be used in the treatment of extrapyramidaldisorders.

The substance according to the invention are thereby as a ruleadministered analogously to known commercially available products(thioridazine and dihydroergocristine), preferably in dosages betweenabout 0.2 and 500 mg, in particular between 0.2 and 50 mg, moreparticularly between 2 and 50 mg per dosage unit. The daily dosage ispreferably between about 0.003 and 10 mg/kg of body weight, morepreferably 0.003 to 1 mg/kg, most preferably 0.03 to 1 mg/kg.

However, the specific dose for each particular patient depends on themost diverse factors, for example on the efficacy of the specificcompound employed, and on the age, body weight, general state of health,sex, diet, time and route of administration, rate of elimination andmedicament combination and the severity of the particular disease towhich the therapy applies. Oral administration is preferred.

Without further elaboration, it is believed that one skilled in the artcan, using the preceding description, utilize the present invention toits fullest extent. The following preferred specific embodiments are,therefore, to be construed as merely illustrative, and not limitative ofthe remainder of the disclosure in any way whatsoever. In the precedingtext and the following examples, all temperatures are set forthuncorrected in degrees Celsius and all parts and percentages are byweight; unless otherwise indicated.

In the following examples, "customary working up" means: water is added,if necessary, the mixture is extracted with methylene chloride, theorganic phase is separated off, dried over sodium sulfate and filtered,the filtrate is evaporated and the residue is purified by chromatographyon silica gel and/or by crystallization. Temperatures are given in °C.

EXAMPLE 1

A solution of 26.3 g of 3-methylsulfonyloxy-methyl-5-phenyl-pyridine(obtainable by reduction of 5-phenyl-pyridine-3-carboxylic acid withLiAlH₄ to give 3-hydroxymethyl-5-phenyl-pyridine and mesylation) and 16g of 4-phenyl-1,2,3,6-tetrahydropyridine in 100 ml of acetonitrile isstirred at 20° for 12 hours and worked up in the customary manner togive 3-(4-phenyl-1,2,3,6-tetrahydropyridylmethyl)-5-phenyl-pyridine("P"), melting point: 80°-82°. Dihydrochloride, melting point:218°-220°.

The following compounds are obtained analogously from the correspondingmethanesulfonates, chlorides or bromides:

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-o-tolylpyridine

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-tolylpyridine

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-tolylpyridine

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-methoxyphenyl-pyridine,melting point: 133°-135°

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-methoxyphenyl-pyridine,dihydrochloride, melting point: 239°-240°

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-fluorophenyl-pyridine,melting point: 128°-129°

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-chlorophenyl-pyridine

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-hydroxyphenyl-pyridine,dihydrochloride, melting point: 206°-208°

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-hydroxyphenyl-pyridine

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-trifluoromethylphenyl-pyridine

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-(3,4-dimethoxyphenyl)-pyridine,dihydrochloride, melting point: 216°-218°

3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-(2-thienyl)pyridine

3-(4-o-tolyl-1,2,3,6-tetrahydropyridyl-methyl)-5-phenylpyridine

3-(4-m-tolyl-1,2,3,6-tetrahydropyridyl-methyl)-5-phenylpyridine

3-(4-p-tolyl-1,2,3,6-tetrahydropyridyl-methyl)-5-phenylpyridine

3-(4-p-methoxyphenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-phenyl-pyridine

3-(4-p-fluorophenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-phenyl-pyridine

3-(4-p-chlorophenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-phenyl-pyridine

3-(4-m-trifluoromethylphenyl-1,2,3,6-tetrahydropyridylmethyl)-5-phenyl-pyridine

3-[4-(4-chloro-3-trifluoromethylphenyl)-1,2,3,6-tetrahydropyridyl-methyl]-5-phenyl-pyridine

3-[4-(2-thienyl)-1,2,3,6-tetrahydropyridyl-methyl]-5-phenylpyridine

3-[4-(2-thienyl)-1,2,3,6-tetrahydropyridyl-methyl]-5-m-tolyl-pyridine

3-[4-(2-thienyl)-1,2,3,6-tetrahydropyridyl-methyl]-5-p-tolyl-pyridine

3-[4-(2-thienyl)-1,2,3,6-tetrahydropyridyl-methyl]-5-p-fluorophenyl-pyridine

3-[4-(3-thienyl)-1,2,3,6-tetrahydropyridyl-methyl]-5-phenylpyridine

3-[1-(4-phenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-phenylpyridine

3-[1-(4-phenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-m-methoxyphenyl-pyridine

3-[1-(4-phenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-p-methoxyphenyl-pyridine

3-[2-(4-phenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-phenylpyridine

3-[2-(4-phenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-m-methoxyphenyl-pyridine

3-[2-(4-phenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-p-methoxyphenyl-pyridine

3-[3-(4-phenyl-1,2,3,6-tetrahydropyridyl)-propyl]-5-phenylpyridine,dihydrochloride, melting point: 239°-241°

3-[3-(4-phenyl-1,2,3,6-tetrahydropyridyl)-propyl]-5-m-methoxyphenyl-pyridine

3-[3-(4-phenyl-1,2,3,6-tetrahydropyridyl)-propyl]-5-p-methoxyphenyl-pyridine

3-(4-p-fluorophenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-fluorophenyl-pyridine

3-[1-(4-p-fluorophenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-p-fluorophenyl-pyridine

3-[2-(4-p-fluorophenyl-1,2,3,6-tetrahydropyridyl)-ethyl]-5-p-fluorophenyl-pyridine

3-[3-(4-p-fluorophenyl-1,2,3,6-tetrahydropyridyl)-propyl]-5-p-fluorophenyl-pyridine

3-[2-(4-(2-thienyl)-1,2,3,6-tetrahydropyridyl)-ethyl]-5-phenyl-pyridine

3-[3-(4-(2-thienyl)-1,2,3,6-tetrahydropyridyl)-propyl]-5-phenyl-pyridine.

EXAMPLE 2

A mixture of 1.84 g of 3-aminomethyl-5-phenylpyridine (obtainable byreduction of 3-cyano-5-phenylpyridine with LiAlH₄) and 2.15 g of1,5-dichloro-3-phenyl-2-pentene in 40 ml of acetone and 40 ml of wateris boiled for 24 hours and worked up in the customary manner. "P",melting point: 80°-82°, is obtained.

EXAMPLE 3

A suspension of4-phenyl-1-(5-phenylnicotinoyl)-1,2,3,6-tetrahydropyridine (meltingpoint: 81°-83°; obtainable by reaction of 5-phenyl-nicotinic acid with4-phenyl-1,2,3,6-tetrahydropyridine in the presence ofcarbonyldiimidazole in THF) in 200 ml of THF is added dropwise to asuspension of 3.8 g of LiAlH₄ in 200 ml of THF, with stirring. Themixture is stirred at 20° for a further 2 hours and worked up in thecustomary manner to give "P", melting point: 80°-82°.

The other compounds mentioned in Example 1 are obtained analogously fromthe corresponding acid amides.

EXAMPLE 4

3.62 g of3-(4-hydroxy-4-phenyl-1-piperidyl-methyl)-5-p-fluorophenyl-pyridine(obtainable by reaction of 3-bromomethyl-5-p-fluorophenyl-pyridine with4-piperidone, subsequent reaction with C₆ H₅ Li and hydrolysis) areheated at 50° with 40 ml of 1N hydrochloric acid for 2 hours and themixture is worked up in the customary manner to give3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-p-fluorophenyl-pyridine,melting point: 128°-129°.

EXAMPLE 5

A mixture of 10 g of3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-methoxyphenyl-pyridineand 10 g of pyridine hydrochloride is stirred at 160° for 3 hours.Customary working up gives3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-hydroxyphenyl-pyridine.Dihydrochloride, melting point: 206°-208°.

EXAMPLE 6

A suspension of 3.56 g of3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-methoxyphenyl-pyridinein 50 ml of 1,2-dichloroethane is added dropwise to a boiling solutionof 15.6 g of dimethyl sulfide-boron tribromide complex in 50 ml of1,2-dichloroethane and the mixture is boiled for a further 30 minutesand worked up in the customary manner to give3-(4-phenyl-1,2,3,6-tetrahydropyridyl-methyl)-5-m-hydroxyphenyl-pyridine,dihydrochloride, melting point: 206°-208°.

The following examples relate to pharmaceutical formulations containingamines of the formula I or their acid addition salts:

EXAMPLE A: TABLETS

A mixture of 1 kg of "P" dihydrochloride, 4 kg of lactose, 1.2 kg ofpotato starch, 0.2 kg of talc and 0.1 kg of magnesium stearate ispressed to tablets in the customary manner such that each tabletcontains 10 mg of active compound.

EXAMPLE B: COATED TABLETS

Tablets are pressed analogously to Example A and are then coated in thecustomary manner with a coating consisting of sucrose, potato starch,talc, tragacanth and colorant.

EXAMPLE C: CAPSULES

Hard gelatine capsules are filled with 2 kg of "P" dihydrochloride inthe customary manner so that each capsule contains 20 mg of the activecompound.

EXAMPLE D: AMPOULES

A solution of 1 kg of "P" dihydrochloride in 60 l of doubly distilledwater is subjected to sterile filtration, ampoules are filled with thesolution, the solution is lyophilized under sterile conditions and theampoules are sealed under sterile conditions. Each ampoule contains 10mg of active compound.

Tablets, coated tablets, capsules and ampoules containing one or more ofthe remaining active compounds of the formula I and/or theirphysiologically acceptable acid addition salts are obtainableanalogously.

The preceding examples can be repeated with similar success bysubstituting the generically or specifically described reactants and/oroperating conditions of this invention for those used in the precedingexamples.

From the foregoing description, one skilled in the art can easilyascertain the essential characteristics of this invention, and withoutdeparting from the spirit and scope thereof, can make various changesand modifications of the invention to adapt it to various usages andconditions.

What is claimed is:
 1. A pyridine derivative of the formula ##STR6##wherein L is --(CH₂)_(n-1) --CO-- and each of R¹ and R² independently isphenyl, 2- or 3-thienyl, or phenyl or 2- or 3-thienyl eachmonosubstituted or disubstituted by alkyl, alkoxy, F, Cl, Br, OH or CF₃,n is 1, 2 or 3, and alkyl and alkoxy each are of 1-4 C atoms or a saltphysiologically acceptable acid addition thereof.